The Observing Self : Diminishing Egocentrism Through Brief Mindfulness Meditation

Peer reviewed

Live volumetric (4D) visualization and guidance of in vivo human ophthalmic surgery with intraoperative optical coherence tomography.

Minimally-invasive microsurgery has resulted in improved outcomes for patients. However, operating through a microscope limits depth perception and fixes the visual perspective, which result in a steep learning curve to achieve microsurgical proficiency. We introduce a surgical imaging system employing four-dimensional (live volumetric imaging through time) microscope-integrated optical coherence tomography (4D MIOCT) capable of imaging at up to 10 volumes per second to visualize human microsurgery. A custom stereoscopic heads-up display provides real-time interactive volumetric feedback to the surgeon. We report that 4D MIOCT enhanced suturing accuracy and control of instrument positioning in mock surgical trials involving 17 ophthalmic surgeons. Additionally, 4D MIOCT imaging was performed in 48 human eye surgeries and was demonstrated to successfully visualize the pathology of interest in concordance with preoperative diagnosis in 93% of retinal surgeries and the surgical site of interest in 100% of anterior segment surgeries. In vivo 4D MIOCT imaging revealed sub-surface pathologic structures and instrument-induced lesions that were invisible through the operating microscope during standard surgical maneuvers. In select cases, 4D MIOCT guidance was necessary to resolve such lesions and prevent post-operative complications. Our novel surgical visualization platform achieves surgeon-interactive 4D visualization of live surgery which could expand the surgeon's capabilities.

Elizabeth Bowen and the art of visuality

This thesis is the first sustained assessment of Elizabeth Bowen’s writing from a visual perspective. By first compiling a visual biography of the author, I argue that Bowen’s responsiveness to art, her relationships with artists, and her knowledge of modern and traditional aesthetics are formative influences on her work. Investigating her assertion that she was a “visual writer,” my discussion develops into an examination of her technique of “verbal painting” through which she reinvents traditional visual modes as a personal modernist idiom. Close textual analysis of Bowen’s fictions forms the dominant methodology of this thesis and facilitates my delineation of her engagement with the Futurist and Surrealist aesthetics in addition to broader aspects of her visuality, including her treatment of the “vividly visual” dream-state to the distinct ocularcentricity of her writing. Ultimately, this thesis seeks to advance our knowledge of Bowen’s visual method and to offer a new approach in which to nuance our understanding of her modernism

Avaliação do Grau de Fidelidade entre a Identidade e a Imagem do Instituto Superior Miguel Torga

O presente trabalho trata de medir a distância entre a Identidade e a Imagem Corporativa do Instituto Superior Miguel Torga. Para este efeito, desenvolveu-se um instrumento que compara os níveis de adequação da instituição a um conjunto de dez adjetivos avaliados sob o ponto de vista da Direção (Identidade) e do ponto de vista dos professores, alunos e funcionários(Imagem). Esta metodologia de investigação teve como base (VILAR, 2006) o pensamento seguido pela corporate identity em que a perspetiva visual aparece com o propósito de melhorar a visibilidade e identificação da organização para uma posição em que é entendido como instrumental na comunicação e da sua estratégia. Neste sentido desenvolvemos um instrumento, questionário composto por dez adjetivos e três logótipos, com o objetivo de avaliar a distância entre Identidade e Imagem por categorias profissionais. / The present thesis is to measure the distance between the Identity and Corporate Image of the Instituto Superior Miguel Torga. for this purpose, we developed a tool that compares the level of adequacy of the institution to a set of ten adjectives assessed from the point of view of the Director (Identity) and the point of view of teachers, students and staff (Image). This research methodology was based on(VILAR, 2006) followed the thought that the corporate identity visual perspective appears in order to improve visibility and identification of the organization to a position where it is seen as instrumental in the communication and its strategy. With this in mind we developed an instrument, a questionnaire composed of ten adjectives and three logos, with the objective of evaluating the distance between Identity and Image by occupational categories.

MINDREADING: INTROVERSION VERSUS EXTRAVERSION

Theory of mind (also called ‘mindreading’), is the ability to explain and predict others’ behaviour by inferring their mental states, such as their knowledge, beliefs, perceptions and desires. One largely unexplored question in theory of mind research is the relationship between personality and theory of mind abilities in adults. The current study investigated introverts’ and extraverts’ performance on two theory of mind tasks: one task involved judging emotional states from pictures of eyes (RMTE task), and the other involved making judgments about one’s own and others’ visual perspective (AVP task). In both tasks, the personal relevance of the situation was varied to examine whether this factor would differentially affect the performance of introverts and extraverts. There was a significant interaction between personality (introvert vs. extravert) and condition (personal vs. impersonal) in the AVP task, with extraverts performing better in the personal than in the impersonal condition but introverts performing the same in both conditions. In the RMTE task there was no interaction, as all participants performed better in the personal condition regardless of personality. There was also a main effect of personality in the RMTE, with introverts performing better overall than extraverts at judging emotions from eyes. Possible reasons behind these and other observed differences are discussed.

Time in Perspective: a visual approach to models of time

Geographical representations of topographical space come in many shapes and are a regular topic of discussion. The depiction of the invisible and maybe even illusory concept of time on the other hand, remains largely unchanged and undisputed. A uniform and arithmetic model of time fits well with the rigid structure of digital data, which might be why it has been widely adopted within HCI. In our proposal, we will present historic and contemporary approaches that offer alternative perspectives on the visual representation of time. Keywords: timeline, chronographics

Why is “blindsight” blind? A new perspective on primary visual cortex, recurrent activity and visual awareness

The neuropsychological phenomenon of blindsight has been taken to suggest that the primary visual cortex (V1) plays a unique role in visual awareness, and that extrastriate activation needs to be fed back to V1 in order for the content of that activation to be consciously perceived. The aim of this review is to evaluate this theoretical framework and to revisit its key tenets. Firstly, is blindsight truly a dissociation of awareness and visual detection? Secondly, is there sufficient evidence to rule out the possibility that the loss of awareness resulting from a V1 lesion simply reflects reduced extrastriate responsiveness, rather than a unique role of V1 in conscious experience? Evaluation of these arguments and the empirical evidence leads to the conclusion that the loss of phenomenal awareness in blindsight may not be due to feedback activity in V1 being the hallmark awareness. On the basis of existing literature, an alternative explanation of blindsight is proposed. In this view, visual awareness is a “global” cognitive function as its hallmark is the availability of information to a large number of perceptual and cognitive systems; this requires inter-areal long-range synchronous oscillatory activity. For these oscillations to arise, a specific temporal profile of neuronal activity is required, which is established through recurrent feedback activity involving V1 and the extrastriate cortex. When V1 is lesioned, the loss of recurrent activity prevents inter-areal networks on the basis of oscillatory activity. However, as limited amount of input can reach extrastriate cortex and some extrastriate neuronal selectivity is preserved, computations involving comparison of neural firing rates within a cortical area remain possible. This enables “local” read-out from specific brain regions, allowing for the detection and discrimination of basic visual attributes. Thus blindsight is blind due to lack of “global” long-range synchrony, and it functions via “local” neural readout from extrastriate areas.

The role of sensation seeking and need for cognition on web-site evaluations : a resource-matching perspective

The Internet theoretically enables marketers to personalize a Website to an individual consumer. This article examines optimal Website design from the perspective of personality trait theory and resource-matching theory. The influence of two traits relevant to Internet Web-site processing—sensation seeking and need for cognition— were studied in the context of resource matching and different levels of Web-site complexity. Data were collected at two points of time: personality-trait data and a laboratory experiment using constructed Web sites. Results reveal that (a) subjects prefer Web sites of a medium level of complexity, rather than high or low complexity; (b)high sensation seekers prefer complex visual designs, and low sensation seekers simple visual designs, both in Web sites of medium complexity; and (c) high need-for-cognition subjects evaluated Web sites with high verbal and low visual complexity more favourably.

Identifying with an avatar : a multidisciplinary perspective

Avatars perform a complex range of inter-related functions. They not only allow us to express a digital identity, they facilitate the expression of physical motility and, through non-verbal expression, help to mediate social interaction in networked environments. When well designed, they can contribute to a sense of “presence” (a sense of being there) and a sense of “co-presence” (a sense of being there with others) in digital space. Because of this complexity, the study of avatars can be enriched by theoretical insights from a range of disciplines. This paper considers avatars from the perspectives of critical theory, visual communication, and art theory (on portraiture) to help elucidate the role of avatars as an expression of identity. It goes on to argue that identification with an avatar is also produced through their expression of motility and discusses the benefits of film theory for explaining this process. Conceding the limits of this approach, the paper draws on philosophies of body image, Human Computer Interaction (HCI) theory on embodied interaction, and fields as diverse as dance to explain the sense of identification, immersion, presence and co-presence that avatars can produce.

Spherical image-based visual servo and structure estimation

This paper presents a formulation of image-based visual servoing (IBVS) for a spherical camera where coordinates are parameterized in terms of colatitude and longitude: IBVSSph. The image Jacobian is derived and simulation results are presented for canonical rotational, translational as well as general motion. Problems with large rotations that affect the planar perspective form of IBVS are not present on the sphere, whereas the desirable robustness properties of IBVS are shown to be retained. We also describe a structure from motion (SfM) system based on camera-centric spherical coordinates and show how a recursive estimator can be used to recover structure. The spherical formulations for IBVS and SfM are particularly suitable for platforms, such as aerial and underwater robots, that move in SE(3).

Generic decoupled image-based visual servoing for cameras obeying the unified projection model

In this paper a generic decoupled imaged-based control scheme for calibrated cameras obeying the unified projection model is proposed. The proposed decoupled scheme is based on the surface of object projections onto the unit sphere. Such features are invariant to rotational motions. This allows the control of translational motion independently from the rotational motion. Finally, the proposed results are validated with experiments using a classical perspective camera as well as a fisheye camera mounted on a 6 dofs robot platform.

An introduction to inertial and visual sensing

In this paper we present a tutorial introduction to two important senses for biological and robotic systems — inertial and visual perception. We discuss the fundamentals of these two sensing modalities from a biological and an engineering perspective. Digital camera chips and micro-machined accelerometers and gyroscopes are now commodities, and when combined with today's available computing can provide robust estimates of self-motion as well 3D scene structure, without external infrastructure. We discuss the complementarity of these sensors, describe some fundamental approaches to fusing their outputs and survey the field.

Decoupled image-based visual servoing for cameras obeying the unified projection model

This paper proposes a generic decoupled imagebased control scheme for cameras obeying the unified projection model. The scheme is based on the spherical projection model. Invariants to rotational motion are computed from this projection and used to control the translational degrees of freedom. Importantly we form invariants which decrease the sensitivity of the interaction matrix to object depth variation. Finally, the proposed results are validated with experiments using a classical perspective camera as well as a fisheye camera mounted on a 6-DOF robotic platform.